Portable power supply



FIG. 1 is a perspective view of a portable power supply showing my new design;

FIG. 2 is a front view of the portable power supply of FIG. 1 ;

FIG. 3 is a rear view of the portable power supply of FIG. 1 ;

FIG. 4 is a left side view of the portable power supply of FIG. 1 ;

FIG. 5 is a right side view of the portable power supply of FIG. 1 ;

FIG. 6 is a top view of the portable power supply of FIG. 1 ;

FIG. 7 is a bottom view of the portable power supply of FIG. 1 ; and,

FIG. 8 is an enlarged view of an encircled portion 8 of the portable power supply of FIG. 1 .

The broken lines depict portions of the portable power supply in which the design is embodied that form no part of the claimed design. 

CLAIM I claim the ornamental design for a portable power supply, as shown and described. 